During pregnancy, taking some medications can affect the growth and development of the fetus, the more common drugs are hormones; after pregnancy, you may take birth control pills, which contain hexestrol, which can easily lead to changes in the sex of the fetus, resulting in the masculinity of the baby girl or the femininity of the baby boy, which is more common. Antibiotics are also commonly used during pregnancy. If you take chloramphenicol or streptomycin or kanamycin unknowingly, it can easily lead to fetal malformation or congenital deafness during fetal life.